I remember it like it was yesterday. There I was in class, horticultural entomology. My professor announced that an emerald ash borer leaves a D-shaped hole and a lilac/ash borer leaves a circular one. She said "D for disaster" and I thought "oh my god". That mnemonic device will stay with me forever.
I was busy downloading hot 9/11 memes that I would immediately neglect to post in my super secret antifa group chat. A true tragedy